Hi, check it out! This is the world's smallest digital dosimeter ie. our radiation meter slash Geiger counter you could say and here it is compared to an Australian 50 cent piece that's absolutely tiny. Thank you very much to Andre beacon of who sent this in. And yes, it's full open-source hardware.

Woohoo! And it's got a sexy little display. It's called the Ultra Micron. Let's check it out, you know, tiny little case. Here it's got a little micro USB on the side which is used for charging and also for extracting the data because it's a data logger.

Even when the thing is switched off, it's actually continuing to log the radiation data and we can actually display it. This is later. start firmware building the thing and it's got statistics that can measure the internal battery voltage and the 360 volt high voltage that would be for the Geiger molar tube in the side. It tells you the current, um, up time.

it's been going for 50 days so you can just leave the thing running I Believe it's got like a 12 month hour battery life or there abouts a simple three button interface. Shane They're not actually labeled here, but this is, you know, sort of like a almost prototype II kind of thing. And we can go back to the main screen here and it shows our dosage level in in this case, micro rut guns per hour. So it's not the more usual art micro sieverts, but it's an easy calculation to I convert.

It'd be nice if he added a software option to what display both. Actually, we've got a little battery gauge there and just an ongoing graph of this thing. It's brilliant. Love the little display and a little backlit matrix.

As you might have heard, it does have a vibration motor in there, so if I turned on it, if it goes over there we go. Little vibration motor and you can set it up so that the alarm I goes off or vibrates when it goes over certain limit and you can hear a slight beep every time it. It gets a tick on the thing as well. and there's a setup menu.

We can actually get in here and we can set various things up. We can reboot all the data, log in and we can turn our vibration no thief here, you know I Wanted to extend the battery life as long as possible. You turn the vibration on the sound if you didn't want to do anything, and sleep timer, and the alarm level once it hits a certain radiation dosage. So that's not just a current value, but that could be a cumulative value.

It shows the current value up there, plus your daily dose as well. so it really is quite neat and you can switch between the weekly dose and the radiation maximum. Nice ten-minute dose I Really like the display on here. It really gives it like a solid segmented look.

You can see this little grid in there so it almost looks like that's a like a proper segment to display rather than a dot matrix. Really quite neat. Apparently that display is from a Nokia 2760 And here's a schematic. and yes, all in Russian.

Of course down here you can read their Russian Fantastic. But we're gonna stm32 processor in here. We've got ourselves a flyback step up which is going to be generating our normal 360 volts. He's got 400 volts here, but I think it actually measures it and that fly back pump there as being that controlled.

Of course switching. they're controlled via the micro. here. it doesn't look like he's tapping off the actual 400 volts and actually dividing that down at all.

It looks like the detection x' come in from the primary side over here. lower voltage going into the micro down here. no micro USB input or the requisite stuff here. We've got ESD protection.

And then of course the 5 volt comes into our little battery charger. It's just a micro chip job, pretty standard. and then we've got ourselves some regulation down here. so that's generating +3 here.

And then we've just got a charge pump our inverter over here which gives us negative 3. There's the vibration motor with its own little mosfet driver. No problems there at all. Not much happening.

We've got else happening. We've got dual crystals here. 32 kilohertz watch crystal of course for the long term data logging. As I said, it can probably go for like a year in low power mode actually.

Morgan We've got another transistor driver for the buzzer over here and the Nokia are 27 60 LCD display - easy. That's just a I squared C type serial interface and I don't know what sensor is used over here. We'll find out in a minute but that's just tapping via 10 me up to the 400 or 360 volt rail and then AC coupled and just giving an impulse into a transistor in the impulse impulse side that just converts it to work 3 volts and goes into your micro so it could detect the pulse from the Geiger motor tube to easy. And it's got a full parts list as well.

And here we go. Our sensor is an SB M10. Well let's crack this puppy open and see what's inside. Mm-hmm now because this thing is are continuously running I've got to be careful here and he does warn me that I shouldn't touch anything inside because there is a three hundred and sixty odd volts if we got yeah, it looks like we might be able to crack something.

Whoa. Open there. It's alright. Here we go: Tada.

Oh yeah, we got got our battery stuck to the back and there is now going a motor tube down in there. Fantastic. Do that. That's a nice little bit of fit to envelope design there.

I've got a cutout in the board around here for our little Geiger Mulla tube and of course the right angle. microSD We've got a hundred milliamp hour battery in there tiny little lithium ion job. There's our flat flex connector down there for our Nokia LCD That's all doing the business very nicely. I Like that and what else we got that looks like our surface mount one of our surface mount crystals LST M micro of course and it's all just very nice.

I don't know what else to I'll show you all Wako much further. of course there there's our vibration motor there. You can see the counterweight there, just spin it around. that's actually it's actually really quite a decent one.

You can really feel it when this thing vibrates, let me tell you. but of course all the magic happens because of this. Geiger Mulla tube here. we won't be able to actually lift that out a tad.

I've got our piezo transducer under there, but yeah, it's not much else. Really nice bit of work to get that into the world's smallest digital Does he meet up? I Love it! And I suspect also that these little pins sticking up here and over here are designed to keep the board stuck down when a like our pushed down to the right height. Nice and snug so it doesn't rattle around when you put the lid on. Crude but effective.

The only real radiation source are having a lab here as a smoke alarm which of course contains one micro curie of americium. So yeah, these are. well, the ionizing are smoke detectors doing as you can see like well, getting like seven or eight background before of micro are rukns per hour. but now we're like up to 28 or something so you know it's it's quite significant.

See, they see the decent spike there. so I it's unusual that the display sort of shifts in this direction. I would have liked it preferred it to shift in the other direction. but anyway, you can see how we had the background before and now it's really.

it's really spiked up there. Neat. so it works if I hold it right on top. I'm actually getting as high as 35 now, so that's pretty decent now.

Americium-241 Here, it's primarily a alpha particle emitter. It does emit some gamma radiation as well, and the Geiger Mala tube is primarily I Believe this particular model, our gamma radiation and the alpha particles of course will be shielded by. you know, thin stuff. you know, paper? like any real, any object, or anything like that.

beta particles need you know, like tin foil or something like that and ionizing gamma radiation? Well, that needs you know. LED Like big thick. You know this stuff all you know, a meter of water or something to stop it. It requires big bulk mass.

But yeah, these little like alpha smoke alarms. I mean you know you wouldn't stick. We wouldn't strap one to the side of your head, but they're generally not too bad. and I've hooked it up to my USB port.

I Had to install an ST micro virtual comm driver so it's using like a serial port interface of selector com3 here. Unfortunately I can't speak Russian So I don't know what any of this means but I am actually reading the live data out of it and hopefully you might be able to extract some of the some of the data out because this thing's been running since he sent it to me. and of course it's been up in a plane at high altitude. you know, thirty thousand feet or something so that it's gonna get a lot more radiation up there.

So we should have you know we should be able to see that Actually, if we could download the logged data from it and if it passed you in the airport x-ray scanners or other stuff for example, then we might be able to see some spikes there. But yeah my Russians A little bit rusty. but here we go. I Hit this button here and it looks like it's downloading something.

So let's see what happens when she gets to 100% shall we? Hopefully it's in, you know, some Excel file or you know, CSV file or something like that. perhaps. but we'll see what happens here. We go.

Ah oh here we go. We got, did we get something here? We go. Look, we've got something. So this is, uh, this is pretty good.

I Like this. this is that today. of course it's the fourth and if we go back, you can see that it's been. it's just sitting.

It's been sitting in my lab here for a while though. Unfortunately, it doesn't seem to go back any further than that. Ah, that's a bit disappointing. I Was hoping to see us, hoping to see something.

It was definitely a ship before that. I'm sure can actually see today where I had it sitting next to the smoke alarm there. had it sit in there for a couple of hours. I actually went to the gym and then went home and came back and finish this video off.

so it was a couple hours there. it was our sitting like you know, right next to it or right on top of the smoke alarm radiation source. So that was the regular background before I put it close and now it's like it's drop back down to like eight so you know it's just the natural wire background radiation. So that is the ultra micron.

That is one very cool little gadget. I Love it! The world's smallest digital dosimeter. Fantastic! Thank you very much Andre for sending that in. And yes, full open-source hardware.

and I'll provide a link to the Github repository yard down below. We can download all the details for it. Fantastic! Not sure if he actually sells it or not, so if you liked it, please give it a big thumbs up because that always helps a lot if you want to discuss it jumping over the Eevblog formal Live YouTube Comments: Catch you next time you.